Band-saw machine.



PATENTED 001*. 27, 1903 M. DIXON. BAND SAW MACHINE. APPLICATION FILEDMAY 19, 1903.

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PATENTED 001*. 27, 1903,

. M. DIXON. BAND SAW MACHINE. APPLIOATIOK FILED MAY 19, 1903.

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UNITED STATES 7 Patented October 2'7, 1903.

PATENT QF ICE.

.BAND-S'AW MACHINE.

SPECIFICATION forming part of Letters Patent No. 742,607, dated October27, 1903.

Application filed May 19, 1903. Serial No. 157,854. (No model.)

To all whom it may concern:

Be it known that I, MITCHELL DIXON, a citi zen of the United States,residing at Brunswick, in the county of Glynn and State of Georgia, haveinvented certain new and useful Improvements in Band-Saw Resawing-Machines; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters and figures ofreference marked thereon,which form a part of this specification.

My invention relates to band-saw machines; and it has for its objectprimarily to construct a machine in which the log or timber will besawed in its travel from one end to the other of the machine and becaused to travel in the opposite direction and in the same path, but adiflerent plane, so as to have another board sawed from the timber inthe return travel of the timber, and so on in alternation until thesawing is finished.

It has further for its object to provide improved features ofconstruction and arrangement of parts for accomplishing the firstnamedobject.

To the accomplishment of the foregoing and such other objects as mayhereinafter appear the invention consists in the construction and in thecombination of parts hereinafter particularly described, and then soughtto be clearly defined by the claims, reference being had to theaccompanying drawings, forming a part hereof, and in which-- Figure 1 isan elevation of the machine. Fig. 2 is a plan of the machine. Fig. 3 isan end elevation. Fig. 4: is a detail plan of the slide-frame whichcarries one of the bandwheels, and Fig. 5 a detail showing a scale forindicating the extent of vertical movement of the carriage whichsupports the log.

In the drawings, the numeral 1 designates the bed of the machine and 2the frame, while 4: and 5 are the band-wheels around which passes theband-saw 6, having teeth on its opposite edges, the shaft 7 of the wheel4: being journaled in suitable boxes 8 and deriving power from asuitable source in the usual way. The wheel 5 has its shaft 9 suitablyjournaled in boxes 10 and 11, supported upon a slide-frame 12, the box11 being capable of independent adjustment by a screw 13, so as toadjust the shaft 9 laterally if for any reason it becomes necessary inorder to preserve proper alinement or for other reasons. Any slack inthe band-saw can be taken up by means of the rod 14, which cooperateswith the ratchet 15, pawl 16, and hand-lever 17, and an automatictension consisting of the weighted arm 18, connected, as usual, with theslide-frame 12, is provided, these parts not'being more in detaildescribed because they are in general use and no claim of novelty ismade therein.

The log or timber A in its travel through the machine is supported upona verticallymovable table 19, which is supported on cams 20, secured toshafts 21, journaled in boxes 22, supported by a frame 23 of anysuitable construction, the table 19 being guided in its verticalmovement by rods 24, one ofcwhich extends upward from each end cross-barof the frame 23 and passes through an opening in the end cross-bars ofthe table 19, as illustrated in Figs. 1 and 2 of the drawings. suitableintervals along the frame 23, and preferably two of them will be securedto each shaft 21, and each shaft at one end will be provided witha'worm-wheel 25,with which will mesh a worm 26 on a worm-shaft 27, therebeing a worm for each worm-wheel, and the Worm-shaft will be journaledin suitable boxes 28, located at appropriate points, and will beprovided with a hand-leve'r29, by

' which the shaft may be turned so as to r0- tate the shafts which carrythe cams, and thus elevate the table 19 to the extent desired in theoperation of sawing the successive boards from the log or timber. Forthe purpose of determining the extent of the vertical movement of thetable in the sawing of each board from the log or timber a suitableindex or scale maybe provided, and, as an illustration of one form ofindex, there may be employed a pinion 30, which will be secured to theworm-shaft 27 and which will mesh with a toothed ring 31, formed with ascale and mounted to rotate on a disk 32, provided with an index-finger33 and supported in any suitable way from the frame of the masuch partsbeing illustrated in Fig. 5 of chine,

The cams 20 will be disposed at' the drawings and not being illustratedmore in detail,because any suitable form of index may be applied in anysuitable way for the purpose.

The movable table 19 is provided at suitable points with idlesupporting-rolls 34 and at proper intervals with positively-drivenfeed-rolls 35, provided at one end with toothed wheels 36, with whichmesh toothed wheels 37, mounted loosely in the adjacent ends of swingingarms 38 and 39, the arms 38 being loosely journaled on the axles of thepositively-driven rolls and the arms 39 being loosely mounted on shafts40, which carry at one end toothed wheels 41, which mesh with thetoothed wheels 37, said shafts 40 at their other ends being providedwith bevel-gears 42, which derive motion from bevel-gears 43 on a shaft44, which is supported by brackets 45 and is provided with a bevel-gear46, meshing with a bevel-gear 47, whose shaft 48 passes through anextension 49 of one of the brackets 45 and is provided at its lower endwith a cone disk 50. The object of mountingthe toothed wheels 37 in thelooselyswinging hangers or arms 38 and 39 is to allow for the elevationand depression of the table 19 in the adjustment of the log or timherwhen sawing boards therefrom. Atsuitable points idle rolls 51 arejournaled in arms 2,suspended loosely from rods 53, so that said idlerolls will rest on top of the log or timber being sawed and will yieldin the vertical movement of the table 19.

Motion is transmitted to the positivelydriven feed-rolls through thebevel-gears and toothed wheel described, said motion being derived fromone or the other of two cone friction-rolls 54, mounted on a shaft 55,supported so as to slide in boxes 56 and having at its end abelt-wheel-57, which is connected by a belt 58 with a pulley 59 on theshaft 7 of the saw band-wheel 4. The shaft is moved longitudinally by asuitable lever 60, so as to throw one or the other of the cone-rolls 54into frictional contact with the cone-disk 50, according to thedirection it is desired to rotate the disk 50 for the purpose of movingthe log or timber in one direction or the other through the machine.When it is desired to move the log or timber in one direction, theproper cone-roll is thrown into frictional contact with the cone-disk.When the log has reached the end of its feed and one board sawed by theband-saw, the table 19 is raised by the worm-shaft the distancenecessary for the thickness of the board to be sawed and the othercone-roll is brought into frictional contact'with the cone-disk,whereupon the direction of rotation of the parts is reversed and the logis carried in the opposite direction and in the same path, but higherplane than before, and thus a second board is sawed from the log, and sothe operation continues in alternation until all the boards have beensawed.

As each board is sawed it is removed and lifted over to the edgermechanism. (Illustrated at the right of Figs. 1 and 2 of the drawings.)This mechanism consists of the shaft 61, provided with the edge-saws 62and provided with the drive-pulley 63, the projecting end of the shaft61 hearing down upon a belt 64, which passes around pulleys on theshafts 65 of the drive feed-rolls 66, which carry the board through theedger. This mechanism is provided with the idle rolls 67, journaled toturn in the swinging arms 68. A further description of these parts isnot necessary, as no novelty is claimed therein.

The numeral 69 designates a friction-wheel on the worm-shaft 27, whichis in frictional contact with a friction-wheel 70 on a shaft 71, whichmay be driven by a belt 72, leading to a loose pulley (not shown) on theshaft 7, so that when the loose pulley is clutched to the shaft powermay be transmitted by the belt 72 to the friction-wheels 69 and 70, soas to quickly return the vertically-movable table 19 to its normalposition after it has reached the limit of its upward movement.

The operation of the several parts will be obvious from the foregoingdescription.

I have illustrated and described with particularity the preferredconstruction of parts; but it is to be understood that changes can bemade and essential features of my invention still be retained.

In Figs. 1, 2, and 3 of the drawings the numeral 73 designates slidingrack-bars having at one end guide-plates or head-blocks 73", which maybe moved up against the side of the log or timber by turning the rod 74,journaled in suitable boxes 75 and provided with toothed wheels 76,which engage the racks of the bars 73, said racks at one end resting onsupporting-rolls 77. This will enable the log or timber to have asuitable guide whatever its width may be.

For the purpose of preventing pinching or binding of the saw by the logat the kerf cut by the saw I provide a separating-blade, one on eachside of the saw, to enter the kerf, so as to separate or spread the logor cant at the kerf, and thus prevent the pinching. The preferredconstruction consists of a shaft 78, supported on the frame 2 andcarrying a rocking beam 79, from the opposite ends of which extend theswinging arms 80, carrying at their lower ends spacing blocks or blades81, one of which is designed to be lowered to the plane of the saw-kerf,so as to enter the same and prevent pinching or binding of the cant onthe saw, the other blade at such time being raised so as to be out ofline with the path of travel of the log through the machine. XVhen thedirection of movement of the log is reversed, the spacing-blade whichwas down is raised and the one that was up is lowered, so that it willenter the kerf and spread the same to prevent pinching on the saw. Thearms carrying the spacing-blades are raised and lowered alternately, andto do this the shaft 78 is provided with a crank 82,

IIS

to which is connected a rod or feed-lever 83, one end of which isconnected to the feedlever 60, so that as the lever 60 is moved to shiftone or the other cone 54 into engagement with the cone-disk to reversethe direction of travel of the cant or log the crank 82 will be turned,so as to raise one spacingblade and lower the other, The feed-lever 83is preferablyconnectedto the crank 82 by a sleeve or collar 84, to whichthe end of the crank has a pivotal connection and through which sleevethe feed-lever 83 will pass, and springs 85 encircle the lever and haveone end bearing against the collar and the other ends against adjustablecollars 86. These springs serve as cushions and enable the pressure formaking operative contact between the driving cones and disk and forchanging position of the spacing-blades to be applied, so that thespacing-blades will be brought into position at the proper time.

Having described my invention and set forth its merits, what I claimis 1. In a band-saw machine, the combination with the saw, of mechanismfor feeding the log or timber past the saw for cutting a board, andmeans for reversing the travel of the feed mechanism to cause the timberto travel in the same vertical plane and opposite direction and in adifierent horizontal plane for cutting another board from the log,substantially as described.

2. In aband-saw machine, the combination with the saw, of avertically-movable table for supporting the timber, mechanism forfeeding the log or timber past the saw to cut a board, means forelevating the table, and means for reversing the feed mechanism to causethe timber to travel in the same vertical plane and in a higherhorizontal plane and opposite direction for cutting another board fromthe timber, substantially as described.

3. In a band-saw machine, the combination with the saw, of avertically-movable table supporting the log or timber, feed mechanismfor moving the log or timber past the saw to cut a board therefrom,means for reversing the direction of feed to move the log or timber inthe opposite direction and in the same vertical plane for cuttinganother board, and means for elevating the table at one end of thetravel of the log, or timber, substantially as described.

4. In a band-saw machine, the combination with the saw, of avertically-movable table to support the log or timber, feed-rolls formoving the log or timber carried by the table, a train of gears fordriving the feed-rolls, a friction cone-disk connected with the train ofgears, cone-rolls to contact with the conedisk, and means for throwingone cone-roll out of contact and another into contact with the cone-diskfor reversing the feed-rolls,

substantially as described.

5. In a band-,saw machine, the combination with the saw, of avertically-movable table, a feed-roll carried by the table and providedwith a toothed wheel, a driven shaft provided with a toothed wheel, atoothed wheel intermediate of the other two and meshing with both ofsaid wheels, said intermediate wheel being journaled in the adjacentends of swinging hangers, and means transmitting power to the feed-rollthrough said wheels, substantially as described.

6. In a band-saw machine, the combination with the saw, of mechanism forfeeding the log or timber past the saw, first in one direction and thenin an opposite direction, a pair of spacing-blades, one on each side ofthe saw, and means for raising and lowering -said blades in alternationto bring one and then the other into line with the saw-kerf so as toenter the kerf and prevent pinching of the saw, substantially asdescribed.

In testimony whereof I affix my signature in presence of two witnesses.

' MITCHELL DIXON. Witnesses:

DAVID MCINTOSH, L. E. MARSHALL.

